Answer:
Fermentation takes over the krebs cycle in anerobiotic conditions. The lack of oxygen prevents oxidative phosphorylation and the formation of new oxidized compounds which can only be reformed through the reduction of pyruvate to lactate: through this process glycolysis can continue to function and we can have the production of ATP. The problem is that only 2 ATPs are formed: this is not enough to sustain the life of the cell so, over a period of time that varies from cell to cell (for example the myocyte survives for 40 min, nerve cells fastly die in ischemia), it will go to death if no new oxygen arrives.
Answer:
According to the “hygiene hypothesis,” the problem with extremely clean environments is that they fail to provide the necessary exposure to germs required to “educate” the immune system so it can learn to launch its defense responses to infectious organisms. Instead, its defense responses end up being so inadequate that they actually contribute to the development of asthma.
Explanation:
Answer: transfer of energy.
Explanation:
Because the lung has two bronchi, it can still function if one bronchus is blocked by a foreign object. No gas exchange will happen to the affected side, and the other lung will compensate for the loss of air. The blocked portion though can become inflamed and can lead to infection and damage.